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A pencil detonator or time pencil is a time fuze designed to be connected to a detonator or short length of safety fuse. They are about the same size and shape as a pencil , hence the name. They were introduced during World War II and developed at Aston House , Hertfordshire , UK .
Video of the test—12 second intro. Operation Wigwam [1] involved a single test of the Mark 90 "Betty" nuclear bomb.It was conducted between Operation Teapot and Project 56 on May 14, 1955, about 500 miles (800 km) southwest of San Diego, California. 6,800 personnel aboard 30 ships were involved in Wigwam.
It has since been set backward 8 times and forward 18 times. The farthest time from midnight was 17 minutes in 1991, and the closest is 89 seconds, set in January 2025. [5] The Clock was moved to 150 seconds (2 minutes, 30 seconds) in 2017, then forward to 2 minutes to midnight in 2018, and left unchanged in 2019. [6]
A bouncing bomb is a bomb designed to bounce to a target across water in a calculated manner to avoid obstacles such as torpedo nets, and to allow both the bomb's speed on arrival at the target and the timing of its detonation to be predetermined, in a similar fashion to a regular naval depth charge.
These devices would detonate the bomb if it was moved in any way. Typically, the safety-arming device used was a clockwork Memopark timer, which armed the bomb up to 60 minutes after it was placed [92] by completing an electrical circuit supplying power to the anti-handling
Nuclear bomb designed to fit inside a suitcase. 1950s Thermometric bomb: Also called a vacuum bomb, or aerosol bomb, this explosive disperses a cloud of gas or liquid. Time bomb: A bomb that is triggered by the timer. Trinitrotoluene: Commonly known as TNT. 1863 Julius Wilbrand: Germany: Unguided bomb: An air-craft dropped bomb that lacks a ...
They would release a "stick" of two to four bombs, usually 500 lb (230 kg) or 1,000 lb (450 kg) bombs preferably equipped with four- to five-second time delay fuzes. The bombs would "skip" over the surface of the water in a manner similar to stone skipping and either bounce into the side of the ship and detonate, submerge and explode next to ...
The Mk 30 Mod 1 Tactical Atomic Demolition Munition (TADM) was a portable atomic bomb, consisting of a Mk 30 warhead installed in a XM-113 case. The XM-113 was 26 inches (660 mm) in diameter and 70 inches (1,800 mm) long, and looked like corrugated culvert pipe. The whole system weighed 840 pounds (380 kg).